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2) Local Lego store w/ Pick a Brick wall... buying PAB elements by the box if available.
3) Contact Lego directly for a bulk purchase of the bricks.
4) Join a LUG that participates in LUGBULK and wait. It's a few months between order and delivery. LUGBULK also limits the amount of the elements and cost of the order, so you'd have to have an understanding LUG to take up that much of an allocation... and LUGBULK is meant to help with the cost of creating public displays.
If you're talking 35000 bricks, you're going to be somewhere between $1750 - $4400 USD depending on the bricks you need and how you source them. (Estimated with $0.05 and $0.125)
As a price point, I needed (800) 2x2 Bricks in Light Bluish Gray for a MOC last month and paid $0.08 on Bricklink for new ones. I could have gotten ~1250 of them in a case for around $0.06 at a Lego store if they had them and would sell them, but the closest store is 3.5 hours away for me.